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FileManager UITests fail when native HTML Imports are disabled. Serve
the test files from the embedded test server to make the HTML imports
polyfill on the UITest test.html page work.

The tests now pass when HTML imports are disabled. All console errors
about Polymer not working are gone.

The Visual Signals xf* files 404 off the embedded test server but the
UITests still PASS.

Test: browser_tests --gtest_filter="FileManagerUITest*"
Bug: 1111393
Change-Id: Iec0133c61b7296ced6bb01fb740e1667b9aa8d0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515379
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Auto-Submit: Noel Gordon <noel@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823401}